IPA: /ˈdɛftɪst/
KK: /dɛftɪst/
The most skillful or quick in movement or action.
She is the deftest dancer in the troupe, impressing everyone with her agility.
Comparative: deft
Superlative: deftest
Deftest → It is formed from "deft" (from Old English "deofe", meaning skillful or dexterous) and the superlative suffix "-est" (meaning most). The word "deftest" means most skillful or most dexterous.
Think of someone who is the "most skillful" — that's what deftest means, combining the idea of being deft with the superlative form.